test(api/v2): use huma.ErrorModel for problem+json assertions

pkg/webtests/huma_errors_test.go

@@ -22,6 +22,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/danielgtaylor/huma/v2"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -43,7 +44,7 @@ func TestHuma_ErrorShapeIsRFC9457(t *testing.T) {
 		ct := rec.Header().Get("Content-Type")
 		assert.Contains(t, ct, "application/problem+json", "forbidden response must use RFC 9457 content type; got %q", ct)
 
-		var body humaErrorBody
+		var body huma.ErrorModel
 		require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &body), "body: %s", rec.Body.String())
 		assert.Equal(t, http.StatusForbidden, body.Status)
 		assert.NotEmpty(t, body.Title, "title is required by RFC 9457")
@@ -56,7 +57,7 @@ func TestHuma_ErrorShapeIsRFC9457(t *testing.T) {
 		ct := rec.Header().Get("Content-Type")
 		assert.Contains(t, ct, "application/problem+json", "validation response must use RFC 9457 content type; got %q", ct)
 
-		var body humaErrorBody
+		var body huma.ErrorModel
 		require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &body), "body: %s", rec.Body.String())
 		assert.Equal(t, http.StatusUnprocessableEntity, body.Status)
 		require.NotEmpty(t, body.Errors, "validation errors must include structured per-field details")

pkg/webtests/huma_label_test.go

@@ -41,19 +41,6 @@ func labelTokenFor(t *testing.T, u *user.User) string {
 	return tok
 }
 
-// humaErrorBody is the RFC 9457 problem+json shape Huma emits by default.
-// Fields are a subset — we only assert what's load-bearing for the tests.
-type humaErrorBody struct {
-	Type   string `json:"type"`
-	Title  string `json:"title"`
-	Status int    `json:"status"`
-	Detail string `json:"detail"`
-	Errors []struct {
-		Message  string `json:"message"`
-		Location string `json:"location"`
-	} `json:"errors"`
-}
-
 // TestHumaLabel mirrors the v1 webtest shape (see project_test.go's TestProject)
 // so the v2 contract can be read side-by-side with the v1 coverage. The goal
 // is to prove v2 is behaviourally compatible with v1 modulo the documented